Oxidation ditch process
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- Issue Time
- Mar 13,2025
Summary
The oxidation ditch process, as a mature activated sludge sewage treatment process, has been widely used throughout the country.
Oxidation ditch process
Introduction:
The oxidation ditch process, as a mature activated sludge sewage treatment process, has been widely used throughout the country. It is a variant of the activated sludge method. Its aeration tank is a closed ditch type, so it is different from the traditional activated sludge method in hydraulic flow state. It is a circulating flow aeration ditch connected end to end, and the sewage infiltrates into it for purification.
Process characteristics:
1. Simplified pretreatment The hydraulic retention time and sludge age of the oxidation ditch are longer than those of general biological treatment methods. Suspended organic matter can be removed more thoroughly at the same time as dissolved organic matter. The discharged residual sludge has been highly stabilized. Therefore, the oxidation ditch does not need a primary sedimentation tank, and the sludge does not need to be anaerobic digested.
2. Small footprint Because the primary sedimentation tank and sludge digestion tank are omitted in the process, and sometimes the secondary sedimentation tank and sludge return device are omitted, the total footprint of the sewage plant is not only not increased, but can be reduced on the contrary.
3. Features of plug flow The oxidation ditch has plug flow characteristics, which makes the dissolved oxygen concentration form a concentration gradient along the length of the pool, forming aerobic, anoxic and anaerobic conditions. Through the reasonable design and control of the system, better nitrogen removal and phosphorus removal effects can be achieved.
4. Simplified process The oxidation ditch and the secondary sedimentation tank are combined into an integrated oxidation ditch, and the oxidation ditch that has been developed in recent years can be used without the secondary sedimentation tank, so that the treatment process is more simplified.
